-99.2% is the change from 625 to 5
Calculation steps:
[( 5 - 625 ) ÷ 625] x 100 = -99.2%
Formula
Percentage change = [(5 - 625) / 625] x 100
Subtract the new number by the original number
5 - 625 = -620
-620 ÷ 625 = -0.992
-0.992 x 100 = -99.2%
Example